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Soil Suitability&Nitrate Loading Study Page 7 St.Patrick's Church, Escalon, CA Project No. 607.1 October 14, 2009 5.0 SOIL PROFILE r' 5.1 Soil Profile Soils in this part of San Joaquin generally consist of a mixture of clay, silt, and sand with some gravel. This material is derived from the Sierran range, and clasts consist mostly of mineral grains such as quartz, feldspars, hornblende, and volcanic rock fragments. Clays are most. commonly derived from the breakdown of rock fragments, feldspar, and mica. The sediments are deposited by the action of rivers, in this case, primarily the Stanislaus. The surface and near-surface deposits are generally referred to as the Modesto or the Mehrton Formation. 4 � According to the 1992 report, Soil Survey of San Joaquin County, California, prepared by the U.S. Agriculture Department, Soil Conservation. Service, the soil on the site is part of the Delhi-Veritas-Tinnin association: "Moderately well drained to somewhat excessively drained course-textured and moderately course- textured soils that are deep to a ceinerz ver deep; on dunes, all al4ctns_xtzd low fan terraces". here are two specific on-site soi s. ne is characterized as Manteca fine, sandy-loam, 0 to 2 percent slopes in the area of the existing residence. It is a moderately well-drained soil on low fan terraces. Most of the parcel is covered with Veritas fine sandy loam — 0 to 2 percent lopes. .Iis is also moderately well-drained soil on low fan terraces. From depths of 11 to 24 inches, the Manteca fine, sandy loam soil is a grayish brown fine sandy loam, and the interval from 24 to 35 inches is indurated fF hardpan. From 35 to 74 inches is variegated light gray sandy loam. The soil may also include Tinnin and Veritas soils. Permeability is moderate. Water intake in irrigated fields is about 1.5 inches per hour. The hardpan may cause buildup of perched water and can impede septic tank drainage. The Veritas soil is generally similar to the Manteca fine sandy loam. The upper 1 15 inches is a grayish brown fine sandy loam. The interval from 15 to about 39 inches is brown or brownish gray sandy loam, and the interval from 39 to 70 Fl� inches variegated gray hardpan layer. North American Technical Service (NATS, 2009) completed a geotechnical study Fof the on site soils to determine if the soil is suitable for the proposed building -� construction. As a part of the study, a 25-deep soil boring was advanced on the site of the proposed chapel. A boring log in the report indicates that below 5 feet (60 inches), the soil is a brown, sandy silt that should be suitable for a septic sewage system. 2937 Veneman Ave.,##$240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 Modesto, CA 95356 Fax: (209)569-0295 i w I I�